First of all, gross.
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Second, "A man coughed up a completely intact, six-inch-wide clot of human blood in the exact shape of the right bronchial tree, leaving doctors perplexed as to how it came out in one piece."
So the good news is: doctors actually do know how it happened, and that this is extremely rare....
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... the bad news is, it's only extremely rare because the "casting" in this scenario is formed of blood. NORMALLY when people cough out these bronchial tree castings they are made out of substances such as mucus... and those castings are much more common.
'
Blood is not as "sticky" as mucus, so it's castings are less likely to hold up to a bought of extreme coughing. However, due to an infection, doctors believe the amount of protein in the man's blood allowed it to hold up better than it normally would have.
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https://www.google.com/amp/s/amp.livescience.com/64259-giant-lung-shaped-blood-clot.html
There are about a dozen arrows on this image to help direct your gaze-- just in case anyone somehow managed to miss the giant red "blood tree" (as under_fire dubbed it) in the middle of the frickin page
,
Second, "A man coughed up a completely intact, six-inch-wide clot of human blood in the exact shape of the right bronchial tree, leaving doctors perplexed as to how it came out in one piece."
'
... the bad news is, it's only extremely rare because the "casting" in this scenario is formed of blood. NORMALLY when people cough out these bronchial tree castings they are made out of substances such as mucus... and those castings are much more common.
'
Blood is not as "sticky" as mucus, so it's castings are less likely to hold up to a bought of extreme coughing. However, due to an infection, doctors believe the amount of protein in the man's blood allowed it to hold up better than it normally would have.
'
https://www.google.com/amp/s/amp.livescience.com/64259-giant-lung-shaped-blood-clot.html
Well, actually when you do both at the same time